rot

Performs rotation of points in the plane.

Description

Given two vectors x and y of n elements, the rot routines compute four scalar-vector products and update the input vectors with the sum of two of these scalar-vector products as follow:

x_i = c*x_i + s*y_i

y_i = c*y_i - s*x_i

API

Syntax

void rot(queue &exec_queue,
     std::int64_t n,
     buffer<T,1> &x,
     std::int64_t incx,
     buffer<T,1> &y,
     std::int64_t incy,
     T_scalar c,
     T_scalar s)

rot supports the following precisions and devices.

T

T_scalar

Devices Supported

float

float

Host, CPU, and GPU

double

double

Host, CPU, and GPU

std::complex<float>

float

Host, CPU, and GPU

std::complex<double>

double

Host, CPU, and GPU

Input Parameters

exec_queue

The queue where the routine should be executed.

n

Number of elements in vector x.

x

Buffer holding input vector x. The buffer must be of size at least (1 + (n - 1)*abs(incx)). See Matrix Storage for more details.

incx

Stride of vector x.

y

Buffer holding input vector y. The buffer must be of size at least (1 + (n - 1)*abs(incy)). See Matrix Storage for more details.

incy

Stride of vector y.

c

Scaling factor.

s

Scaling factor.

Output Parameters

x

Buffer holding updated buffer x.

y

Buffer holding updated buffer y.